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Sonoff DW2 Wireless Contact Sensor RF 433MHz
Door & Window Sensors

Sonoff DW2 Wireless Contact Sensor RF 433MHz

Key features:

  • Battery-powered
  • Wireless range up to 50m
  • Connectivity: RF
  • RF Frequency: 433 MHz
See full description

Top specs

  • Connection Method

    Wireless

    Connects to the installation system via a wireless communication protocol. Powered by battery.

  • Connectivity

    The wireless communication protocol supported by the contact for connection with the alarm system or other devices.

  • RF Frequency

    433

    The alarm system or device to which the door sensor will be wirelessly connected must have the same frequency (433 MHz) in order to operate.

  • Battery

    Powered wirelessly by battery.

  • Compatible Battery

    The type of compatible battery that powers the sensor
  • Smart Ecosystem IFTTT
  • See all

User Manual

5 99 €
Delivery by Wed, 18 Nov
Free   shipping cost
From MS Electronics 5.0 (3)
5.0 (3 reviews)
Αγ. Αθανάσιος, Λεμεσού
20 pieces
See Household Sensors & Alarms on the page of MS Electronics

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Product report

Description

Description

Smart sensor for doors and windows

  • Reminds you when the door/window opens. Stay connected with SONOFF smart products for an easier smart life.
  • The sensor will send you a push notification immediately if someone is detected opening your door or window.


Highly efficient battery

It adopts low power consumption technology that ensures the sensor operates normally for 2 years with a door opening/closing frequency of three times a day.

Safety in every corner of the house

Return to History

Automatic storage of message notifications. You can check the history files for the last 3 months.

Smart solutions in practice

  • Do you want the hallway to light up when you enter the door?
  • Just connect the SONOFF switch or light to the sensor and go. 

*The status and performance need to be set on different devices.

Quick Installation

  • Installation in seconds.
  • Tool-free installation.
  • Features 3M adhesive on the bottom of the sensor for easier installation. 

*Ensure that the installation gap is less than 5 mm when the door or window is closed.

At a glance...

  • The sensor sends notifications to the app on the phone
  • Sharing
  • History check
  • Smart solutions 
  • IFTTT function
  • Low consumption


Specifications

  • Battery: mn27 (not included)
  • Standby current: ≤40μA
  • Transmission current: PE≤ 15mA
  • Operating temperature: -10℃ to 40℃
  • Dimensions: 70x31x19 mm 
  • Communication: RF 433 MHz
  • Material: PC V0

Manufacturer

Manufacturer Details

Warnings & Safety Information
See full description

Specifications

Specifications

Product Guides

User Manual

Specifications

Connection Method
Wireless

Connection Method

Wireless

Connects to the installation system via a wireless communication protocol. Powered by battery.
RF Frequency
433 MHz

RF Frequency

433

The alarm system or device to which the door sensor will be wirelessly connected must have the same frequency (433 MHz) in order to operate.
Battery
Yes

Battery

Powered wirelessly by battery.
Battery Type
A27

Battery Type

The type of compatible battery that powers the sensor
Metallic
No

Metallic

Heavy-duty metal contact suitable for use on iron doors, shutters, garage doors, etc.
Tamper
No

Tamper

Refers to protection against attempts to tamper with the device. For example, if someone tries to open the sensor's casing or remove it from its position, the sensor will send an alarm signal.
Pieces
1 pcs

Installation

Screw-in
No

Screw-in

Can be installed with screws.
Adhesive
Yes

Adhesive

Can be installed with adhesive tape.
Recessed
No
Nailed
No

Smart Attributes

Connectivity
RF

Connectivity

The wireless communication protocol supported by the contact for connection with the alarm system or other devices.
Smart Ecosystem
IFTTT

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

See all specifications

Reviews (15)

Reviews

3.9
15
3.9
Review this product
  1. 9
  2. 1
  3. 1
  4. 2
  5. 2
Review this product

What do users say? AI-generated summary

The overall picture is fairly positive: when it works properly, the sensor reliably detects opening and works well with an RF Bridge for automation. It is described as useful in Home Assistant setups and for door-open alerts. However, several users report disconnections or failures, while some units drain the battery quickly and typically send a signal only when the door opens.

  • Ralu_K
    1
    Ralu_K

    Verified purchase

    Fake kids. After 2 months of operation, it starts having problems with wifi connection and after 1 month it breaks down completely

    Translated from Greek ·
    Did you find this review helpful?
  • nikos_poutsikis
    2
    1 out of 3 members found this review helpful
    nikos_poutsikis

    The extender is to blame, it's just a battery eater. It works well sometimes, but it doesn't always send a disconnection notification. I don't know if it's because it's playing through the extender, but it shouldn't. It sends a notification when the door is closed and when it's opened though

    Translated from Greek ·
    Did you find this review helpful?
  • Gio_Chris
    3
    7 out of 12 members found this review helpful
    Gio_Chris

    Verified purchase

    Attention, it only sends a signal when opening and not when closing, so for example, you only know if someone opened the door and not if they closed it.

    Other than that, it works fine.

    Translated from Greek ·
    Did you find this review helpful?
  • gianniskotsou83
    2
    9 out of 9 members found this review helpful
    gianniskotsou83

    I bought 5 contacts. 2 of them worked fine. The other 3, for some reason, drained the batteries in seconds and you could tell because the batteries were overheating. At first, I thought it was the batteries, but I bought new ones, tested them, put them on, and the 3 contacts still didn't work. They just drained the batteries. Possibly faulty pieces?
    I want to emphasize that the RF version only has one state, it simply sends a signal that the contact has opened to an RF bridge, unlike the wifi version which is standalone and has an open/close state where you can work with it better in scenarios.

    Translated from Greek ·
    Did you find this review helpful?
  • aystelios
    5
    5 out of 6 members found this review helpful
    aystelios

    It does what it says. It is a Single State Sensor, which means it simply sends a signal when the door opens only. Together with Sonoff's RF Bridge, I have installed them in HomeAssistant and all automations work perfectly.

    Translated from Greek ·
    Did you find this review helpful?
  • 1
    0 out of 2 members found this review helpful
    bmwm3343ps

    Continuous disconnections. Unacceptable!

    Translated from Greek ·
    Did you find this review helpful?
  • 5
    Doominios

    Verified purchase

  • 4
    Iliopoulos Dimitris

    Verified purchase

  • 5
    VonNotich

    Verified purchase

  • 5
    stavros_poulogianopoulos

    Verified purchase

  • 5
    stoperman18

    Verified purchase

  • 5
    alemara

    Verified purchase

  • 5
    Stephanie Quinn

    Verified purchase

  • 5
    G!annis
    Expert user

    Verified purchase

  • 5
    SimpleStam

    Verified purchase

  • Ralu_K
    1
    Ralu_K

    Fake kids. After 2 months of operation, it starts having problems with wifi connection and after 1 month it breaks down completely

    Translated from Greek ·
    0
  • nikos_poutsikis
    2
    nikos_poutsikis

    The extender is to blame, it's just a battery eater. It works well sometimes, but it doesn't always send a disconnection notification. I don't know if it's because it's playing through the extender, but it shouldn't. It sends a notification when the door is closed and when it's opened though

    Translated from Greek ·
    1
  • Gio_Chris
    3
    Gio_Chris

    Attention, it only sends a signal when opening and not when closing, so for example, you only know if someone opened the door and not if they closed it.

    Other than that, it works fine.

    Translated from Greek ·
    7
  • gianniskotsou83
    2
    gianniskotsou83

    I bought 5 contacts. 2 of them worked fine. The other 3, for some reason, drained the batteries in seconds and you could tell because the batteries were overheating. At first, I thought it was the batteries, but I bought new ones, tested them, put them on, and the 3 contacts still didn't work. They just drained the batteries. Possibly faulty pieces?
    I want to emphasize that the RF version only has one state, it simply sends a signal that the contact has opened to an RF bridge, unlike the wifi version which is standalone and has an open/close state where you can work with it better in scenarios.

    Translated from Greek ·
    9
  • aystelios
    5
    aystelios

    It does what it says. It is a Single State Sensor, which means it simply sends a signal when the door opens only. Together with Sonoff's RF Bridge, I have installed them in HomeAssistant and all automations work perfectly.

    Translated from Greek ·
    5
  • See all
Questions (1)

Questions

200 users have this product and can help you

Ask for the product
MINAS_SAKER

Έχω αγοράσει 3 αλλά δεν μπορώ να κάνω pairing, είδα στο internet ότι χρειάζεται να πατήσω κάποιο button (τύπου reset) μέσα σε μια τρύπα. Δοκίμασα με το εργαλειάκι που έχουν τα κινητά, με συνδετήρα αλλά τίποτα. Έχετε καμιά ιδέα;

MINAS_SAKER 2024-02-02
Nikos_2020

Καλησπέρα θέλει και την μονάδα rf να δεν δουλεύουν μόνα τους τα συγκεκριμένα

Nikos_2020 2024-04-16
Verified purchase
1 Reply Reply to
See all questions (1)

Description & Specifications

Smart sensor for doors and windows

  • Reminds you when the door/window opens. Stay connected with SONOFF smart products for an easier smart life.
  • The sensor will send you a push notification immediately if someone is detected opening your door or window.


Highly efficient battery

It adopts low power consumption technology that ensures the sensor operates normally for 2 years with a door opening/closing frequency of three times a day.

Safety in every corner of the house

Return to History

Automatic storage of message notifications. You can check the history files for the last 3 months.

Smart solutions in practice

  • Do you want the hallway to light up when you enter the door?
  • Just connect the SONOFF switch or light to the sensor and go. 

*The status and performance need to be set on different devices.

Quick Installation

  • Installation in seconds.
  • Tool-free installation.
  • Features 3M adhesive on the bottom of the sensor for easier installation. 

*Ensure that the installation gap is less than 5 mm when the door or window is closed.

At a glance...

  • The sensor sends notifications to the app on the phone
  • Sharing
  • History check
  • Smart solutions 
  • IFTTT function
  • Low consumption


Specifications

  • Battery: mn27 (not included)
  • Standby current: ≤40μA
  • Transmission current: PE≤ 15mA
  • Operating temperature: -10℃ to 40℃
  • Dimensions: 70x31x19 mm 
  • Communication: RF 433 MHz
  • Material: PC V0

Manufacturer

Manufacturer Details

Warnings & Safety Information

Product Guides

User Manual

Specifications

Connection Method
Wireless

Connection Method

Wireless

Connects to the installation system via a wireless communication protocol. Powered by battery.
RF Frequency
433 MHz

RF Frequency

433

The alarm system or device to which the door sensor will be wirelessly connected must have the same frequency (433 MHz) in order to operate.
Battery
Yes

Battery

Powered wirelessly by battery.
Battery Type
A27

Battery Type

The type of compatible battery that powers the sensor
Metallic
No

Metallic

Heavy-duty metal contact suitable for use on iron doors, shutters, garage doors, etc.
Tamper
No

Tamper

Refers to protection against attempts to tamper with the device. For example, if someone tries to open the sensor's casing or remove it from its position, the sensor will send an alarm signal.
Pieces
1 pcs

Installation

Screw-in
No

Screw-in

Can be installed with screws.
Adhesive
Yes

Adhesive

Can be installed with adhesive tape.
Recessed
No
Nailed
No

Smart Attributes

Connectivity
RF

Connectivity

The wireless communication protocol supported by the contact for connection with the alarm system or other devices.
Smart Ecosystem
IFTTT

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

Reviews (15)

3.9
15
3.9
Review this product
  1. 9
  2. 1
  3. 1
  4. 2
  5. 2
Review this product

What do users say? AI-generated summary

The overall picture is fairly positive: when it works properly, the sensor reliably detects opening and works well with an RF Bridge for automation. It is described as useful in Home Assistant setups and for door-open alerts. However, several users report disconnections or failures, while some units drain the battery quickly and typically send a signal only when the door opens.

  • Ralu_K
    1
    Ralu_K

    Verified purchase

    Fake kids. After 2 months of operation, it starts having problems with wifi connection and after 1 month it breaks down completely

    Translated from Greek ·
    Did you find this review helpful?
  • nikos_poutsikis
    2
    1 out of 3 members found this review helpful
    nikos_poutsikis

    The extender is to blame, it's just a battery eater. It works well sometimes, but it doesn't always send a disconnection notification. I don't know if it's because it's playing through the extender, but it shouldn't. It sends a notification when the door is closed and when it's opened though

    Translated from Greek ·
    Did you find this review helpful?
  • Gio_Chris
    3
    7 out of 12 members found this review helpful
    Gio_Chris

    Verified purchase

    Attention, it only sends a signal when opening and not when closing, so for example, you only know if someone opened the door and not if they closed it.

    Other than that, it works fine.

    Translated from Greek ·
    Did you find this review helpful?
  • gianniskotsou83
    2
    9 out of 9 members found this review helpful
    gianniskotsou83

    I bought 5 contacts. 2 of them worked fine. The other 3, for some reason, drained the batteries in seconds and you could tell because the batteries were overheating. At first, I thought it was the batteries, but I bought new ones, tested them, put them on, and the 3 contacts still didn't work. They just drained the batteries. Possibly faulty pieces?
    I want to emphasize that the RF version only has one state, it simply sends a signal that the contact has opened to an RF bridge, unlike the wifi version which is standalone and has an open/close state where you can work with it better in scenarios.

    Translated from Greek ·
    Did you find this review helpful?
  • aystelios
    5
    5 out of 6 members found this review helpful
    aystelios

    It does what it says. It is a Single State Sensor, which means it simply sends a signal when the door opens only. Together with Sonoff's RF Bridge, I have installed them in HomeAssistant and all automations work perfectly.

    Translated from Greek ·
    Did you find this review helpful?
  • 1
    0 out of 2 members found this review helpful
    bmwm3343ps

    Continuous disconnections. Unacceptable!

    Translated from Greek ·
    Did you find this review helpful?
  • 5
    Doominios

    Verified purchase

  • 4
    Iliopoulos Dimitris

    Verified purchase

  • 5
    VonNotich

    Verified purchase

  • 5
    stavros_poulogianopoulos

    Verified purchase

  • 5
    stoperman18

    Verified purchase

  • 5
    alemara

    Verified purchase

  • 5
    Stephanie Quinn

    Verified purchase

  • 5
    G!annis
    Expert user

    Verified purchase

  • 5
    SimpleStam

    Verified purchase

  • Ralu_K
    1
    Ralu_K

    Fake kids. After 2 months of operation, it starts having problems with wifi connection and after 1 month it breaks down completely

    Translated from Greek ·
    0
  • nikos_poutsikis
    2
    nikos_poutsikis

    The extender is to blame, it's just a battery eater. It works well sometimes, but it doesn't always send a disconnection notification. I don't know if it's because it's playing through the extender, but it shouldn't. It sends a notification when the door is closed and when it's opened though

    Translated from Greek ·
    1
  • Gio_Chris
    3
    Gio_Chris

    Attention, it only sends a signal when opening and not when closing, so for example, you only know if someone opened the door and not if they closed it.

    Other than that, it works fine.

    Translated from Greek ·
    7
  • gianniskotsou83
    2
    gianniskotsou83

    I bought 5 contacts. 2 of them worked fine. The other 3, for some reason, drained the batteries in seconds and you could tell because the batteries were overheating. At first, I thought it was the batteries, but I bought new ones, tested them, put them on, and the 3 contacts still didn't work. They just drained the batteries. Possibly faulty pieces?
    I want to emphasize that the RF version only has one state, it simply sends a signal that the contact has opened to an RF bridge, unlike the wifi version which is standalone and has an open/close state where you can work with it better in scenarios.

    Translated from Greek ·
    9
  • aystelios
    5
    aystelios

    It does what it says. It is a Single State Sensor, which means it simply sends a signal when the door opens only. Together with Sonoff's RF Bridge, I have installed them in HomeAssistant and all automations work perfectly.

    Translated from Greek ·
    5
  • See all
5,99 €
Free   shipping cost